Defensive publication

ABSTRACT

STABLE, AQUEOUS DISPERSIONS OF COPOLYMERS OF 65 TO 97 PERCENT ETHYLENE AND 35 TO 3 PERCENT OF AN ALPHA,BETAETHYLENICALLY UNSATURATED CABOXYLIC ACID, SUCH AS METHACRYLIC ACID, ARE PROVIDED WHICH HAVE SOLIDS CONTENTS GREATER THAN 50 PERCENT AND IN WHICH LESS THAN 10 PERCENT OF THE ACID GROUPS IN THE COPOLYMER ARE NETURALIZED WITH METAL IONS SUCH AS NA+ OR K+. THESE DISPERSIONS RETAIN THE ADHESION PROPERTIES AND CHEMICAL REACTIVITY OF FREE ACID GROUPS. THE DISPERSIONS ARE PREPARED BY DISSOLVING THE COPOLYMER IN A WATER-IMMISCIBLE SOLVENT MIXTURE OF A HYDROCARBON SOLVENT AND A POLAR LIQUID, DISPERSING THE SOLUTION IN WATER WHICH CONTAINS AMMONIA OR A VOLATILE ORGANIC AMINE AND AN ALKALI METAL HYDROXIDE IN AN AMOUNT TO NEUTRALIZE LESS THAN 10 PERCENT OF THE ACID GROUPS IN THE COPOLYMER, AND EVAPORATING THE SOLVENTS FROM THE RESULTING DISPERSION.

\ DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at therequest of the applicant or owner in accordance with the Notice of Dec.:16, 1969, 869 O.G. 687. The abstracts of Defensive Publicationapplications are identified by distinctly numbered series and arearranged chronologically. The heading of each abstract indicates thenumber of pages of specification, including claims and sheets ofdrawings contained in the application as originally filed. The files ofthese applications are available to the public for inspection andreproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to themerits of alleged invention. The Patent Ofiice makes no assertion as tothe novelty of the disclosed subject matter.

PUBLISHED OCTOBER 30, 1973 T915,015 AQUEOUS DISPERSIONS OF ETHYLENE CO-POLYMERS AND PROCESSES FOR THEIR PREPARATION Thomas Charles Bissot, DeerRun Road, RD. 3, Newark, Del. 19711, and Vernon Clare Wolff, Jr., 1400Ivy Drive, Webster Farms, Wilmington, Del. 19803 Continuation-impart ofapplication Ser. No. 164,477, July 20, 1971, which is acontinuation-in-part of application Ser. No. 805,381, Mar. 7, 1969, bothnow abandoned. This application Mar. 22, 1973, Ser. No. 343,685

Int. Cl. C08f 27/00, 45/44, 47/20 US. Cl. 260-29.6 TA No Drawing. 15Pages Specification Stable, aqueous dispersions of copolymers of 65 to97 percent ethylene and 35 to 3 percent of an alpha,betaethylenicallyunsaturated carboxylic acid, such as methacrylic acid, are providedwhich have solids contents greater than 50 percent and in which lessthan 10 percent of the acid groups in the copolymer are neutralized withmetal ions such as Na+ or K These dispersions retain the adhesionproperties and chemical reactivity of free acid groups. The dispersionsare prepared by dissolving the copolymer in a water-immiscible solventmixture of a hydrocarbon solvent and a polar liquid, dispersing thesolution in water which contains ammonia or a volatile organic amine andan alkali metal hydroxide in an amount to neutralize less than 10percent of the acid groups in the copolymer, and evaporating thesolvents from the resulting dispersion.

